m11.4 extended

Question 1

what is the vapour cycle order

Answer 1

compression, condensation, receiver dryer, expansion, evaporation, repeat

Question 2

what are the 2 refrigerants used

Answer 2

R12 and R134a

Question 3

can refrigerants be mixed

Answer 3

no

Question 4

what is the boiling point of tetrafluoroethane R134a

Answer 4

26’C or 15’F

Question 5

Where are ram air doors usually found

Answer 5

on the wing to body fairing

Question 6

what does the mix chamber/manifold do

Answer 6

collect the temp controlled air

then distribute it to flight compartment

Question 7

where are trim air valves found

Answer 7

the distribution ducting

Question 8

how is bypass air controlled

Answer 8

anti ice valve / low limit valve

Question 9

what are the 2 functions of the condenser/reheater

Answer 9

1- cool the air in the pack to let the moisture collect in the water collector

2- heat the air in the pack to add energy, and add efficiency to the turbine.

Question 10

what are the leak detection methods

Answer 10

applying soapy solution, checking for bubbles

injecting special leak detection dyes

Question 11

what is the benefit of low cabin humidity

Answer 11

prevents growth of fungus and bacteria

Question 12

what mode is used during taxi

Answer 12

ground/flight - flight

Question 13

what mode is used during decent/landing

Answer 13

ground/flight - ground

Question 14

troposphere range

Answer 14

earth surface to 38000 ft

Question 15

3 pressurisation modes

Answer 15

isobaric
manual
differential

Question 16

what happens to flight crew at 10 000 ft

Answer 16

they must be on oxygen

Question 17

what happens to pax at 15 000 ft

Answer 17

they must be put on emergency oxygen